SEAL LIP TYPE 5P4734 - Caterpillar

At operating temperature, the hydraulic oil tank is hot and under pressure. Hot oil can cause burns. To prevent possible personal injury, release the pressure in the implement hydraulic circuits (boom, stick and bucket) before any hydraulic lines or components are disconnected or removed.
1. Release the pressure in the implement hydraulic system as follows:a. Fully retract the rod in the stick cylinder.b. Adjust the position of the bucket so that it will be flat on the ground when the boom is lowered.c. Lower the boom until the bucket is flat on the ground.d. Shut off the engine.e. Check the pilot pressure at the implement pilot system test port at the pilot manifold assembly under the cab. If the pressure is below 3000 kPa (435 psi) connect an auxiliary pump unit to this port and pump the pilot pressure to 4000 kPa (580 psi).f. Put the hydraulic activation control lever in the "Unlock" position and turn the start key to RUN. DO NOT START THE MACHINE.g. Move the control levers for boom, bucket, stick and swing to all full stroke positions and actuate both bottom dump trigger switches (if so equipped) on the front of the control handles. This should release any pressure that might be present in the main implement system. Disconnect the auxiliary pump unit (if used) and install the pressure gauge at the test port. Continue to move the control levers until the pilot system pressure is released. Verify the pilot system pressure is released with the pressure gauge.h. Press the relief valve button on the hydraulic tank breather to release the tank pressure.i. The pressure in the system has been released and lines and components can be removed or disconnected.
View From Under The Cab
View From Under The Cab2. Put identification marks on all hose assemblies that are connected to the pilot resolver valve (1). Disconnect all hose assemblies (2) that are connected to the pilot resolver valve. Put plugs in the hose assemblies to keep dirt and debris out of the hydraulic system.3. Disconnect electrical connectors (3).4. Remove two bolts (4) and use two people to remove pilot resolver valve (1). The weight of the pilot resolver valve is approximately 45 kg (100 lb). The following steps are for the installation of the pilot resolver valve.5. Check the condition of all O-rings used in the hose assemblies that are connected to the pilot resolver valve. If any of the seals are worn or damaged, use new parts for replacements.6. Put the pilot resolver valve (1) in position on the machine. Install two bolts (4) that hold it.7. Connect all hose assemblies (2) to pilot resolver valve (1) in their original locations. Reconnect connectors (3).8. Check the oil level in the hydraulic oil tank. If necessary, refill the hydraulic oil tank with oil to the correct level. Refer to the Operation & Maintenance Manual for the correct capacity and fluid.Disassemble & Assemble Pilot Resolver Valve
Fluid Spillage ContainmentCare must be taken to ensure that fluids are contained